Book/Report

FZJ-2018-03445

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Workshop on mesons and mesonic states up to slightly above 1Gev/c(e+2) : Jülich, 19. - 20. Februar 1990

Oelert, W. (Editor) ; Sefzick, T. (Editor)FZJ*

1991
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18887

Report No.: Juel-2469

Abstract: The new accelerator COSY-Jülich will provide protons with momenta up to 3 .3 GeV/c. Thus an effective mass slightly above 1 GeV/c 2 can he produced in the pp-interaction. Employing higher mass targets also heavier mesons can he observed. The production of single mesons and of mesonic states with and without strangeness can be investigated at COSY. The structure of some mesons in the mass range of 950 McV/c$^{2}$ to 1020 MeV/c$^{2}$ is still not well understood. While the $\varnothing$(1020) at the upper limit of this range is believed to he of rather pure ss nature the content of the $\eta$'(958) meson at the lower limit of this range is still under discussion. New results suggest that what is called the $\int_{f}$ meson (former notation S*) consists in reality of two close and narrow states; one of them being a s$\overline{s}$ - quarks configuration while the other should he a flavour singlet which couples to $\pi \pi$ and K$\overline{K}$: with similar strengths. Also the discussion on possible gluonium candidates is still alive. It is speculated that some of these mesons - till now supposed to have widthsof 30 to 50 MeV/c$^{2}$ - could rather be an overlay of structures with much smaller widths. Another feature of resonances in this region is their partial decay into the K$\overline{K}$ channel if their actual mass is large enough. Strong decays in K$\overline{K}$ could be a signal of a K$\overline{K}$ "molecular" nature of the resonances. In particular the atomic K ' K- structure should exist.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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